<template>
  <div>
    <!-- 头部部分 -->
    <header class="header">
      <h1>todos</h1>
      <input class="new-todo" 
      placeholder="请输入任务名称" 
     v-model.trim="taskName"
     @keydown.enter="addTask"
      autofocus />
    </header>
  </div>
</template>

<script>
export default {
  name: 'TodoHeader',

  data() {
    return {
      taskName : ''
    };
  },

  methods: {
    addTask() {
      if(this.taskName ==='') return alert('请输入数据')
      this.$emit('hAdd',this.taskName)
      this.taskName =''
    } 
  },
};
</script>

<style lang="scss" scoped>

</style>